LOCATION NOTCH OR
Tentative Series
IRD.DCR
02/2025
NOTCH SERIES
Landscape--Mazama High Cascade mountains
Landform--volcanic cones, dissected volcanoes
Slope--2 to 30 percent
Parent material--pumice and coarse volcanic ash over basalt or andesite bedrock
Mean annual precipitation--about 1600 mm
Mean annual air temperature--about 3 degrees C
Depth class--moderately deep
Drainage class--excessively drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, amorphic Andic Haplocryods
TYPICAL PEDON: Notch loamy coarse sand, on a forested volcanic cone with a slope of 8 percent and an elevation of 2067 m (All textures are apparent field textures).
Oi--0 to 1 cm; slightly decomposed plant material; abrupt wavy boundary
Oe--1 to 5 cm; moderately decomposed plant material, black (10YR 2/1) dry, black (10YR 2/1) moist; abrupt wavy boundary
E--5 to 11 cm; loamy coarse sand, light gray (10YR 7/1) dry, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine through medium roots; many very fine interstitial pores; 12 percent pumice paragravel; very strongly acid (pH 4.8); abrupt wavy boundary
Bhs--11 to 28 cm; paragravelly ashy loamy coarse sand, variegated brown (7.5YR 5/3) and dark brown (7.5YR 3/3) dry, dark brown (7.5YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine through coarse roots; many very fine interstitial pores; 25 percent pumice paragravel; moderately acid (pH 5.7); abrupt wavy boundary
BC--28 to 57 cm; paragravelly ashy loamy coarse sand, light yellowish brown (10YR 6/4) dry, brown (7.5YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; few medium and very fine roots; many very fine interstitial pores; 25 percent pumice paragravel; moderately acid (pH 5.9); abrupt wavy boundary
C--57 to 72 cm; paragravelly ashy coarse sand, very pale brown (10YR 7/3) dry, pale brown (10YR 6/3) moist; single grain; loose, nonsticky, nonplastic; few medium roots; many fine interstitial pores; 20 percent pumice paragravel, and 5 percent basalt stones; slightly acid (pH 6.2); abrupt wavy boundary
2R--72 cm; indurated basalt
TYPE LOCATION: Lane County, Oregon, about 4 km east of Waldo Lake in Willamette National Forest; 670 m north and 140 m west of the southeast corner of section 34, T. 21 S., R. 6 E., Willamette Meridian; latitude 43.70710, longitude -121.98550, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 5 degrees C
Depth to lithic contact--50 to 100 cm
Clay content--0 to 5 percent
Fine-earth fraction--contains more than 50 percent medium through very coarse sand
Estimated properties of layers influenced by volcanic ash
*Volcanic glass content in 0.02 to 2.0 mm fraction--60 to 90 percent
*1500 kPa water (air-dried samples)--5 to 12 percent
*1500 kPa water (undried)--10 to 20 percent
*1/3-bar bulk density--0.5 to 0.9 g/cm3
O horizons
*Composition--slightly to moderately decomposed plant material
*Combined thickness--0 to 10 cm
E horizon
*Value--4 or 5 moist, 6 or 7 dry
*Chroma--1 or 2 moist and dry
*Fine-earth texture--loamy coarse sand, coarse sand
*Pumice paragravel content--0 to 15 percent
*Phosphate retention--less than 25 percent
*Ammonium oxalate Al plus 1/2 Fe--less than 1.0 percent
*Reaction--pH 4.5 to 5.5
*Thickness--1 to 12 cm
Bhs horizon
*Value--3 or 4 moist, 3 to 5 dry
*Chroma--3 or 4 moist or dry
*Pumice paragravel content--5 to 35 percent
*Reaction--pH 5.1 to 5.9
*Phosphate retention--50 to less than 85 percent
*Ammonium oxalate Al plus 1/2 Fe--2 to 4 percent
*Thickness--5 to 20 cm
BC horizon
*Hue--10YR or 7.5YR
*Value--4 or 5 moist, 5 to 7 dry
*Chroma--3 or 4 moist or dry
*Fine-earth texture--ashy loamy coarse sand, ashy coarse sand
*Pumice paragravel content--15 to 35 percent
*Reaction--pH 5.6 to 6.5
*Phosphate retention--50 to less than 85 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 3 percent
*Thickness--20 to 40 cm
C horizon
*Value--4 or 5 moist, 6 or 7 dry
*Chroma--3 or 4 moist or dry
*Total fragment content--15 to 60 percent
*Pumice paragravel content--15 to 60 percent
*Cobble content--0 to 5 percent
*Stone content--0 to 15 percent
*Reaction--pH 6.1 to 6.5
*Phosphate retention--50 to less than 85 percent
*Ammonium oxalate Al plus 1/2 Fe--1 to 3 percent
*Thickness--15 to 40 cm
COMPETING SERIES:
Arahustan--spodic horizon 20 to 60 cm thick, frost free period 60 to 90 days
Longmire--greater than 150 cm to bedrock
Moolack--greater than 150 cm to bedrock
GEOGRAPHIC SETTING:
Elevation--1950 to 3000 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--1400 to 1900 mm
Mean annual air temperature--2 to 4 degrees C
Frost-free period--30 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Wilchutes--50 to 85 cm to medial soil material; located on structural benches, volcanic cones
Waldor--50 to 75 cm to redox concentrations; located on ground moraines
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--excessively drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--very high
USE AND VEGETATION:
Use--recreation, wildlife habitat
Potential natural vegetation--mountain hemlock, grouse whortleberry, forked woodrush, and partridgefoot; commonly supports a mountain hemlock/forked woodrush (CMG212) plant association (see Field Guide to the Forested Plant Associations of the Westside Central Cascades of Northwest Oregon)
DISTRIBUTION AND EXTENT: Mazama High Cascade Mountains, Oregon; MLRA 3; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Willamette National Forest, Lane County, Oregon; 2022; name from Notch Lake
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 30 to 72 cm
*Ochric epipedon
*Albic horizon--5 to 11 cm
*Spodic horizon--11 to 28 cm
*Volcanic glass--zone from 5 to 72 cm
*Andic soil properties--zone from 11 to 150 cm
*Depth to lithic contact--72 cm
*Lithologic discontinuity--72 cm
*Typical pedon ID--2021OR039796
National Cooperative Soil Survey
U.S.A.